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2008 - MX-5 - Transmission/Transaxle

DTC P2758 [SJ6A-EL]



DTC P2758

Torque converter clutch (TCC) stuck on

DETECTION CONDITION

  • TCM detects that TCC control solenoid does not change from off when engine is running

    Diagnostic support note:
  • The MIL illuminates if the TCM detects the above malfunction condition in two consecutive drive cycles.

  • PENDING CODE is available.

  • FREEZE FRAME DATA is not available.

  • The AT warning light illuminates.

  • The DTC is stored in the PCM memory.

POSSIBLE CAUSE

  • ATF level low

  • Deteriorated ATF

  • TCC control solenoid, and line pressure control solenoid stuck

  • Line pressure low

  • Control valve stuck

  • TCM malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
  • Has the FREEZE FRAME DATA been recorded?

Yes

Go to the next step.

No

Record the FREEZE FRAME DATA on the repair order, then go to the next step.

2

VERIFY RELATED REPAIR INFORMATION AVAILABILITY
  • Verify related Service Bulletins and/or on-line repair information availability.

  • Is any related repair information available?

Yes

Perform repair or diagnosis according to the available repair information.

  • If the vehicle is not repaired, go to the next step.

No

Go to the next step.

3

INSPECT ATF CONDITION

Yes

Go to the next step.

No

If the ATF color is milky or reddish brown, replace ATF, then go to Step 7.

(See AUTOMATIC TRANSMISSION FLUID (ATF) REPLACEMENT [SJ6A-EL].)

4

INSPECT ATF LEVEL

Yes

Go to the next step.

No

Add ATF to the specified level, then go to Step 7.

(See AUTOMATIC TRANSMISSION FLUID (ATF) LEVEL ADJUSTMENT [SJ6A-EL].)

5

INSPECT LINE PRESSURE

  • Are the line pressures within the specifications?

Yes

Go to the next step.

No

All ranges: Replace the oil pump, then go to Step 7.

Any ranges: Replace the control valve body, then go to Step 6.

(See CONTROL VALVE BODY REMOVAL [SJ6A-EL].)

(See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)

6

INSPECT SOLENOID VALVE

Yes

Go to the next step.

No

Replace the control valve body, then go to the next step.

(See CONTROL VALVE BODY REMOVAL [SJ6A-EL].)

(See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)

7

VERIFY TROUBLESHOOTING OF DTC P2758 COMPLETED

  • Make sure to reconnect all the disconnected connectors.

  • Clear the DTC from the memory using the M-MDS.

  • Start the engine.

  • Warm up engine and AT.

  • Drive the vehicle under the following conditions for 2 s or more.

    • ATF temperature (TFT PID): 20 °C {68 °F} or more

    • Engine speed: less than 3,000 rpm

    • Drive in the D range, 4GR—6GR (TCC operation)

  • Is PENDING CODE for this the DTC present?

Yes

Replace the TCM, then go to the next step.

(See TCM REMOVAL/INSTALLATION [SJ6A-EL].)

No

Go to the next step.

8

VERIFY AFTER REPAIR PROCEDURE

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [SJ6A-EL].)

No

DTC troubleshooting completed.




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